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  1. #1
    Garmin/GPS Systems GMod. Firmware downgrade for 721xs to recognize custom maps
    Firmware downgrade for 721xs to recognize custom mapsFirmware downgrade for 721xs to recognize custom mapsFirmware downgrade for 721xs to recognize custom mapsFirmware downgrade for 721xs to recognize custom mapsFirmware downgrade for 721xs to recognize custom mapsFirmware downgrade for 721xs to recognize custom mapsFirmware downgrade for 721xs to recognize custom maps
    Neil's Avatar
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    I have a plotter SD card update from September 2014 which contains some unit updates for V3.80 but i don't know your unit's HWID. Please advise what it is and if i have what you want i'll upload it [to find HWID from the home screen, select Configure>System>System Information].
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  3. #2
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    Hello Neil and thank's for the quick reply. I love this forum
    I looked up the system Info, but couldn't find any HWID, only serial #[removed] but I am just a old fart and by no means a computer crack.
    The units to which the update aply are:
    GPSMAP 527/527xs/547/547xs/557/557xs
    GPSMAP 721/721xs/741/741xs/751/751xs
    GPSMAP 820/820xs/840xs/1020/1020xs/1040xs
    EchoMAP 50s/50dv/70s/70dv
    Maybe that can help?
    alex
    Last edited by Neil; 18th July 2015 at 10:19 AM. Reason: remove s/no for security.

 

 

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